I've heard a lot about how Microsoft is implementing UEFI Secure Boot in Windows 8. Apparently it prevents "unauthorized" bootloaders from running on the computer, to prevent malware. There's a campaign by the Free Software Foundation against secure boot, and a lot of people have been saying online that it's a "power grab" by Microsoft to "eliminate free operating systems".
If I get a computer that has Windows 8 and Secure Boot preinstalled, will I still be able to install Linux (or some other OS) later? Or does a computer with Secure Boot only ever work with Windows?